This is the 6195th most frequent Japanese word.
キコ
"キコ" does not have a specific standalone meaning in Japanese; it may be a name or part of a larger context.
In this sentence, キコ is used as a proper noun, representing person's name 'Kiko'.
キコは公園で走っています。
Kiko is running in the park.
Here, キコ is part of a sound descriptor 'キコキコ', imitative of creaking sounds or repeated patterns.
風の音はキコキコと響いた。
The sound of the wind echoed as kikko-kikko.
キコ in this context is used slightly abstractly, instructing to refrain from metaphorical wandering or indecision.